I knew I should have tinyurl'd them
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Since the brackets are handy for positioning things like photosensors, they often end up leaving on something I've built for a customer, so I consider them consumable and don't get fancy with finishing. But looking at the photos, I must have set the camera in rust enhancing mode. You probably wouldn't see the rust on the actual parts unless you noticed it first in the pics.
Ned Simmons